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Appendix A
Special Considerations
To initiate operation between a Model 3244MV and the Tri-Loop, you
must consider the configuration of the both the Differential
Temperature and the Hot Backup features, if used. For complete
information regarding the Differential Temperature and Hot Backup
features, refer to the Models 3144 and 3244MV Product Manual,
Rosemount publication number 00809-0100-4724.
Differential Temperature Measurement
To enable the differential temperature measurement feature of a
3244MV operating in conjunction with the Tri-Loop, adjust the range
end points of the corresponding channel on the Tri-Loop to include zero.
For example, if you wish the secondary variable of the 3244MV to
report differential temperature, configure the transmitter accordingly
(see Set Process Variable Output Order on page A-2), and adjust
the corresponding channel of the Tri-Loop so one range end point is
negative and the other is positive.
Hot Backup
To enable the Hot Backup feature of a Model 3244MV operating in
conjunction with the Tri-Loop, ensure that the output units of the
sensors are the same as the units of the Tri-Loop. You may use any
combination of RTDs or thermocouples as long as the units of both
match the units of the Tri-Loop.
NOTE
When configured for Hot Backup, if sensor 1 (primary) fails, sensor 2
automatically becomes the primary. An alarm does not occur unless
sensor 2 also fails.
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